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JPL Small-Body Database Browser
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C/2018 L2 (ATLAS)
Classification: Comet          SPK-ID: 1003574
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2458481.5 (2018-Dec-29.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9929812976392138 4.7417e-06  
a 243.8785560967669 0.16497 au
q 1.711710997421499 1.763e-06 au
i 67.42359017314774 2.579e-05 deg
node 243.0182586407085 1.9746e-05 deg
peri 56.23081761810727 5.6893e-05 deg
M .006837041121172771 6.9618e-06 deg
tp 2458455.080503252766
(2018-Dec-02.58050325)
0.00011886 TDB
period 1391101.597963301
3808.63
1411.5
3.864
d
yr
n .0002587877122181965 2.6258e-07 deg/d
Q 486.0454011961122 0.32878 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -2.68845020714355E-8 1.577E-9
A2 [EST] -1.795780426319288E-9 1.316E-9
  Orbit Determination Parameters
   # obs. used (total)      731  
   data-arc span      996 days (2.73 yr)  
   first obs. used      2017-04-29  
   last obs. used      2020-01-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .55101  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:33:44  

Additional Information
 Earth MOID = .985359 au 
 Jupiter MOID = 1.13622 au 
 T_jup = 0.643 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 9.5   0.7 20 2 parameter fit from 407 observations, autocmod 2.9c
comet total magnitude slope K1 10.75   n/a 20 autocmod 2.9c
comet nuclear magnitude M2 12.0   0.6 20 from 270 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 20 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 20 autocmod 2.9c

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2018.9   C/2018 L2       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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